Working inside the Apollo 16 Saturn V space vehicle at the launch pad, Grumman Aerospace Corporation technician Ken Crow attaches a plaque bearing the names and signatures of the Apollo 16 crew to the front leg of the lunar module's descent stage. The stainless steel plaque, which will remain on the lunar surface, measures 18 by 23 cm (seven by nine inches) and will bear the names of the Apollo 16 astronauts, John W. Young, mission Commander; Thomas K. Mattingly II, Command Module Pilot; and Charles M. Duke, Jr., Lunar Module Pilot.